[Dark Mode] the combobox refuses dark theme when on first tabpage of a tabcontrol

[Zheng-Li01]

.NET version

latest .NET 10.0 build

Did it work in .NET Framework?

No

Did it work in any of the earlier releases of .NET Core or .NET 5+?

This is a regression issue, not reproduce .NET 9.0

Issue description

The combobox refuses dark theme when on first tabpage of a tabcontrol
Expected Results:

Actual Results:

Steps to reproduce

1. Create a .NET winforms project with a TabCpntrol control
2. Add a Combobox contorl in the tabPage1
3. Set app under Dark mode in program.cs file
   Application.SetColorMode(SystemColorMode.Dark);
4. Run the application

More info:

1. The issue can reproduce when setting the DropDownStyle as DropDown/DropDownList, not reproduce when setting the DropDownStyle as Sample